The origin of coercivity decrease in fine grained Nd-Fe-B sintered magnets

被引：160
|
作者：
Li, W. F. [1 ]
Ohkubo, T. [1 ]
Hono, K. [1 ]
Sagawa, M. [2 ]
机构：
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
[2] Intermetall Co Ltd, Kyoto 6158206, Japan
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2009年 / 321卷 / 08期
关键词：
NdFeB; Microstructure; Grain size; Coercivity; Nd-rich phase; NUCLEATION CONTROLLED MAGNETS; MAGNETIZATION REVERSAL; PERMANENT-MAGNETS; PARTICLE-SIZE;
D O I：
10.1016/j.jmmm.2008.10.032
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microstructures of fine grained Nd-Fe-B sintered magnets that were produced by the pressless process were investigated to understand the origin of the sudden coercivity decrease below a certain grain size. The intrinsic coercivity is inversely proportional to In D-2 with the highest coercivity of 17 kOe at D similar to 4.5 mu m, below which the coercivity drops as the grain size decreases. We found that the degradation of the coercivity of the magnet with a grain size of 3 mu m was mainly caused by the inhomogeneous distribution of fcc-Nd oxide whose volume fraction increased with respect to the dhcp Nd-rich phase. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：1100 / 1105
页数：6
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